Spoils of war are a part or parts of a monster's body or an object used by a monster that does not disintegrate when killed. Many spoils of war are seen in the Big House Attic. A spoil of war can also be the result of defeated demigods, such as armor or weapons. Some spoils of war are so disgusting and/or useless the receivers do not accept them. If it's a body part, it's likely the monster eventually regrows them as Medusa had her head cut off and used in ancient times yet was still resurrected with it to get it cut off again by Percy Jackson.
Known Spoils of War
In Percy Jackson and the Olympians and The Heroes of Olympus
| Monster | Item | Owner/Receiver |
| The Minotaur | Horn | Percy Jackson |
| Ladon | Claw | Luke Castellan (Now at Camp Half-Blood) |
| Centaur | Hoof (or horn if evil variety) | A Laistrygonian Giant |
| Hydra | Head(s) | Camp Half-Blood |
| Medusa | Head | Percy Jackson (Discarded) |
| Kampê | Kampê's Scimitars | Unknown (Now in the Big House Attic) |
| Nemean Lion | Pelt | Percy Jackson (Now belonging to Poseidon) |
| Geryon | Geryon's Cowboy Boots | Eurytion and Orthrus |
| Stheno | Vial of toxic Gorgon blood from the left-side of Stheno's body | Formerly in the possession of Frank Zhang; drank by Phineas |
| Euryale | Vial of healing Gorgon blood from the right-side of Euryale's body | Formerly in the possession of Frank Zhang; drank by Percy Jackson |
| Phineas | Bathrobe covered in ketchup and slippers | Percy Jackson (Discarded) |
| Lydian Drakon | Outer skin | Clarisse |
| Gegeines | Dirt bits and Loincloth | Many (Discarded) |
| Stymphalian Birds | Dead body | Camp Half Blood (Eaten) |
| Cancer | Outer Shell | Percy Jackson (Discarded) |
| Hyperborean Giant | Frozen body | Many (Discarded) |
| Hellhound | Fur (Occasionally just melts away) | Many (Discarded) |
| Antaeus | Loincloth | Percy Jackson (Discarded) |
| Karpoi | Grain or cereal they symbolize | Many (Discarded) |
| Chrysaor | Helmet and Loot | Crew of the Argo II (Sacrificed to Bacchus) |
| Achelous | Cornucopia | Piper McLean (Later sacrificed to Phobos and Deimos) |
| Orion | Mechanical eyes and bow | Reyna (Discarded) |
In Ancient Times
| Monster | Part | Owner/Receiver |
| Medusa | Head | Perseus |
| Ladon | A Golden Apple he guarded | Hercules |
| Nemean Lion | Pelt | Hercules |
| Hydra | Hydra Blood | Hercules |
| Achelous | Cornucopia | Hercules |